USER’S MANUAL
ISL8270MEVAL1Z
Evaluation Board
The ISL8270M is a 25A step-down DC/DC power supply
module with integrated digital PWM controller, synchronous
power switches, an inductor and passives. Only bulk input and
output capacitors are needed to finish the design. The 25A of
continuous output current can be delivered without a need of
airflow or a heatsink. The ISL8270M uses ChargeMode
TM
control architecture, which responds to a transient load within
a single switching cycle.
The ISL8270MEVAL1Z evaluation board is a 3in x 4.5in 4-layer
FR4 board with 2 oz. copper in all layers. This evaluation board
comes with a placeholder for pin-strap resistors to adjust
output voltage, switching frequency, input undervoltage (UVLO)
protection threshold, and device PMBus address. More
configuration such as soft-start and fault limits can be easily
programmed or changed via PMBus compliant serial bus
interface.
ZLUSBEVAL3Z (USB to PMBus™ adapter) is provided with this
evaluation kit, which connects the evaluation board to a PC to
activate the PMBus communication interface. The PMBus
command set is accessed by using the PowerNavigator™
evaluation software from a PC running Microsoft Windows.
AN1926
Rev 1.00
August 15, 2014
Key Features
• V
IN
range of 4.5V to 14V, V
OUT
adjustable from 0.6V to 5V
• Programmable V
OUT
, margining, UV/OV, I
OUT
limit,
soft-start/stop, sequencing, and external synchronization
• Monitor: V
IN
, V
OUT
, I
OUT
, temperature, duty cycle, switching
frequency and faults
• ChargeMode
TM
control tunable with PMBus
• Mechanical switch for enable and power-good LED indicator
Recommended Equipment
• DC power supply with minimum 15V/20A sourcing capacity
• Electronic load capable of sinking current up to 25A
• Digital multimeters (DMMs)
• Oscilloscope with higher than 100MHz bandwidth
Functional Description
The ISL8270MEVAL1Z provides all circuitry required to
evaluate the features of the ISL8270M. A majority of the
features of the ISL8270M, such as compensation-free
ChargeMode
TM
control, soft-start delay and ramp times, supply
sequencing, and voltage margining are available on this
evaluation board. For sequencing evaluation, the board can be
connected to any Intersil digital module evaluation board that
supports the Digital-DC™ (DDC) bus.
Figure 1
shows a board image of the ISL8270MEVAL1Z
evaluation board.
References
ISL8270M
datasheet
Ordering Information
PART NUMBER
ISL8270MEVAL1Z
DESCRIPTION
ISL8270M Kit (EVB, ZLUSBEVAL3Z Adapter,
USB Cable)
INTERCONNECTS DDC AND
SYNC BETWEEN BOARDS
PGOOD LED
INTERCONNECTS DDC AND
SYNC BETWEEN BOARDS
ENABLE SWITCH
CONNECT TO ZLUSBEVAL3Z
DONGLE. FOR MULTIPLE BOARD
EVALUATION, CONNECT
TO PMBUS DONGLE
OUT CONNECTION OF OTHER
BOARD
TO DAISY CHAIN PMBus
CONNECTION
PLACEHOLDER FOR SMA
CONNECTOR TO MONITOR
VOUT RIPPLE
FIGURE 1.
ISL8270MEVAL1Z EVALUATION BOARD IMAGE
AN1926 Rev 1.00
August 15, 2014
Page 1 of 10
ISL8270MEVAL1Z
Operation
PMBus Operation
The ISL8270M utilizes the PMBus protocol. The PMBus
functionality can be controlled via ZLUSBEVAL3Z dongle from a
PC running the PowerNavigator™ evaluation software in a
Windows XP or Windows 7 operating systems.
Install the evaluation software from the following Intersil
website:
www.intersil.com/powernavigator
For board operation, connect the included ZLUSBEVAL3Z dongle
to the 6-pin male connector labeled as “PMBus DONGLE IN”.
Connect the desired load and an appropriate power supply to the
input and connect the included USB cable to the PC running the
PowerNavigator™ evaluation software. Place the ENABLE
switches in “DISABLE” before turning on the power.
The evaluation software allows modification of all ISL8270M
PMBus parameters. The ISL8270M device on the board has been
pre-configured as described in this document, but the user may
modify the operating parameters through the evaluation
software or by loading a predefined set-up from a configuration
file. A sample
“Configuration File” on page 5
is provided and can
be copied to a notepad editor to make desired changes.
The ENABLE switch can then be moved to “ENABLE” and the
ISL8270MEVAL1Z board can be tested. Alternately, the PMBus
ON_OFF_CONFIG and OPERATION commands may be used from
the PowerNavigator™ GUI.
9. To change switching frequency, disconnect board from the set
up and populated 1% standard 0603 resistor at R2 placeholder
location on bottom layer. Refer to the “Switching Frequency
Resistor Settings” table in the
ISL8270M
datasheet for
recommended values.
10. To change UVLO, disconnect board from the set up and
populated 1% standard 0603 resistor at R7 placeholder
location on bottom layer. Refer to the “UVLO Resistor Settings”
table in the
ISL8270M
datasheet for recommended values.
PMBus Option
ISL8270MEVAL1Z can be evaluated for all features using the
provided ZLUSBEVAL3Z dongle and PowerNavigator™ evaluation
software. Follow these steps to evaluate ISL8270M with PMBus
option.
1.
2.
3.
4.
5.
6.
Install PowerNavigator™ software.
Set ENABLE switch to “DISABLE”.
Connect Load to VOUT lug connectors (J7 and J8).
Connect power supply to VIN connectors (J3 and J4). Make sure
power supply is not enabled when making connection.
Turn power supply on.
Connect ZLUSBEVAL3Z dongle (USB to PMBus™ adapter) to
ISL8270MEVAL1Z board to the 6-pin male connector labeled as
“PMBus DONGLE IN”.
Connect supplied USB cable from computer to USB to
ZLUSBEVAL3Z dongle.
Launch PowerNavigator™ software.
Set ENABLE switch to “ENABLE”.
Monitor and configure the ISL8270MEVAL1Z board using
PMBus commands in the evaluation software.
PowerNavigator™ tutorial videos are available at Intersil website.
www.intersil.com/powernavigator
For sequencing via Digital-DC™ Bus (DDC) or to evaluate multiple
Intersil digital power products using a single ZLUSBEVAL3Z
dongle, ISL8270M can be daisy chained with other digital power
evaluation boards. PMBus address can be changed by placing a
1% standard 0603 resistor at the R
4
placeholder location on the
bottom layer. Refer to the “SMBus Address Resistor Selection”
table in the
ISL8270M
datasheet for recommended values.
7.
8.
9.
10.
11.
12.
Quick Start Guide
Pin-Strap Option
The ISL8270MEVAL1Z can be configured in pin-strap mode with
standard 1% 0603 resistors. PMBus interface is not required to
evaluate ISL8270M in pin-strap mode. Output voltage (V
OUT
),
switching frequency (F
SW
), input under-voltage protection (UVLO)
threshold and device PMBus address can be changed by
populating recommended resistors at placeholders provided in
the evaluation board. By default, the evaluation board is
programmed to regulate at V
OUT
= 1.2V, F
SW
= 533kHz,
UVLO = 4.5V, and PMBus address = 28h. Follow these steps to
evaluate ISL8270M in pin-strap mode.
1. Set ENABLE switch to “DISABLE”.
2. Connect Load to VOUT lug connectors (J7 and J8).
3. Connect power supply to VIN connectors (J3 and J4). Make
sure power supply is not enabled when making connection.
4. Turn power supply on.
5. Set ENABLE switch to “ENABLE”.
6. Measure 1.2V VOUT at probe points (TP10 and TP11).
7. Observe switching frequency of 533kHz at probe point
labeled VSWH (TP1).
8. To change VOUT, disconnect board from the setup and
populated 1% standard 0603 resistor at R6 placeholder
location on bottom layer. Refer to the “Output Voltage
Resistor Settings” table in the
ISL8270M
datasheet for
recommended values. By default, VOUT_MAX is set 110% of
V
OUT
set by pin-strap resistor.
Thermal Considerations and
Current Derating
Board layout is very critical in order to make the module operate
safely and deliver maximum allowable power. To work in the high
temperature environments and carry large currents, the board
layout needs to be carefully designed to maximize thermal
performance. To achieve this, select enough trace width, copper
weight and the proper connectors.
This evaluation board is designed for running 25A at room
temperature without additional cooling systems needed. However, if
the output voltage is increased or the board is operated at elevated
temperatures, then the available current is derated. Refer to the
derated current curves in the
ISL8270M
datasheet to determine the
maximum output current theevaluation board can supply.
JA
is
measured by inserting thermocouple inside the module to measure
peak junction temperature.
AN1926 Rev 1.00
August 15, 2014
Page 2 of 10
ISL8270MEVAL1Z Board Schematic
MSTR_EN
SCL
SDA
SALRT
J1
J15
SW1
GT11MCBE
R1
MSTR_SYNC
R4
1
OPEN
R7
OPEN
1
PG
1
2
1
2
27
29
28
25
24
23
21
20
19
18
17
R5
4.7K
39
SALRT
SGND
VSET
MGN
SDA
SCL
NC
NC
SA
DDC
XTEMP+
XTEMP-
NC
NC
PGND
EN
2
1
JP1
VDD
16
38
V25
TP2
TP3
VIN
PG
C6
10uF
Q1
2N7002
1
2
J5
J6
37
VDDC
2
DNP
3
TP6
VSEN+
VSEN-
TP7
SGND
VSEN+
VSEN-
6
7
8
VDDC
SGND
15
J9
VR5
1
1
C15
1.0uF
2
3
DNP
VDRVOUT
VR6
1
C8
10uF
2
9
C7
1uF
1
1
1
J3
VIN
35
VR6
TP5
2.2
2
1
R3
+
2
10
34
VDRVIN
C13
470uF
+
1
TP8
PGND
PHASE
36
PGND
VR5
TP4
2
5
4
2
1
2
3
4
5
6
MSTR_SYNC
RSVD1
GND
DDC
RSVD2
RSVD3
1
2
3
4
5
6
UVLO
V25
2
1
1
3 2
2
PG
SYCN
1
2
2
NC
+
C1
150uF
1
+
2
2
C2
150uF
1
11
1
1
1
VIN
PGND
VSEN+
NC
TP10
VOUT
J7
J4
2
2
2
C5
22uF
C4
22uF
C3
22uF
14
VOUT
1
KPA8CTP
31
1
1
1
TP9
1
2
2
2
2
100 uF
C9
100 uF
C10
100 uF
C11
100 uF
C12
J8
VOUT
1
KPA8CTP
12
PGND
VSWH
TP11
U1
ISL8270MIRZ
13
30
TP1
FIGURE 2. APPLICATION CIRCUIT
40
VSEN-
2
AN1926 Rev 1.00
August 15, 2014
Page 3 of 10
ISL8270MEVAL1Z
3
2
2
2
1
1
2
3
4
5
6
SDA
SALRT
SCL
GND
Vi2c
MSTR_EN
2
1
2
10K
1
1
VR5
1
2
3
4
5
6
1
D1
R9
1K
R6
OPEN
VR5
OPEN
R2
DISABLE
ENABLE
R8
10K
4
6
C14
470uF
R11
200
ISL8270MEVAL1Z
Bill of Materials
REFERENCE DESIGNATOR
C7
C3-C5
C15
C8
C6
C9, C10, C11, C12
C1, C2
C13, C14
TP8, TP10
TP9, TP11
J3, J4
J2, J6
J1, J5
D1
U1
Q1
R5
R2, R4, R6, R7
R3
R9
R1, R8
R11
SW1
J7, J8
J9
JP1
TP1-TP7
QTY
1
3
1
1
1
4
2
2
2
2
2
2
2
1
1
1
1
0
1
1
2
1
1
2
0
0
0
PANASONIC
PANASONIC
KOA
PANASONIC
ITT CANNON
BERG/FCI
TE CONNECTIVITY
ERJ-3RQF2R2V
ERJ-3EKF1001V
RK73H1JT1002F
ERJ-8ENF2000V
GT11MCBE
KPA8CTP
5-1814832-1
MANUFACTURER
MURATA
MURATA
PANASONIC
PANASONIC
TDK
TDK
SANYO/PANASONIC
SANYO/PANASONIC
KEYSTONE
KEYSTONE
KEYSTONE
SAMTEC
SAMTEC
CHICAGO MINIATURE
INTERSIL
MANUFACTURER PART
GRM188R71E105KA12D
GRM32ER71E226KE15L
ECJ-0EB0J105K
ECJ-1VB1A106M
C2012X5R1E106K
C3225X5R0J107M
16TQC150MYF
6TPF470MAH
5000
5001
575-4
SSQ-103-02-T-D-RA
TSW-103-08-T-D-RA
CMD17-21VGC/TR8
ISL8270MIRZ
DESCRIPTION
CAP, SMD, 0603, 1µF, 25V, 10%, X7R, ROHS
CAP, SMD, 1210, 22µF, 25V, 10%, X7R, ROHS
CAP, SMD, 0402, 1µF, 6.3V, 10%, X5R, ROHS
CAP, SMD, 0603, 10µF, 10V, 20%, X5R, ROHS
CAP, SMD, 0805, 10µF, 25V, 10%, X5R, ROHS
CAP, SMD, 1210, 100µF, 6.3V, 20%, X5R, ROHS
CAP-POSCAP, SMD, 7.3X4.3, 150µF, 16V, 20%,
50mΩ, ROHS
CAP TANT 470µF 6.3V 20%
CONN-MINI TEST PT, VERTICAL, RED, ROHS
CONN-MINI TEST PT, VERTICAL, BLK, ROHS
CONN-JACK, MINI BANANA, 0.175 PLUG,
NICKEL/BRASS, ROHS
CONN-SOCKET STRIP, TH, 2X3, 2.54mm, TIN,
R/A, ROHS
CONN-HEADER, 2X3, BRKAWY, 2.54mm, TIN,
R/A, ROHS
LED, SMD, 0805, GREEN, CLEAR, 10mcd, 2.1V,
20mA, 570nm, ROHS
IC-25A DIGITAL DC/DC PMBUS MODULE, 26P,
QFN, ROHS
TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23,
60V, 115mA, ROHS
RES, SMD, 0603, 4.7k, 1/10W, 1%, TF, ROHS
RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE
HOLDER
RES, SMD, 0603, 2.2Ω, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 1k, 1/10W, 1%, TF, ROHS
RES, SMD, 0603, 10k, 1/10W, 1%, TF,ROHS
RES, SMD, 1206, 200Ω, 1/4W, 1%, TF, ROHS
SWITCH-TOGGLE, THRU-HOLE, SPDT, 5P, ROHS
HDWARE, MTG, CABLE TERMINAL, 6-14AWG,
LUG and SCREW, ROHS
DO NOT POPULATE
DO NOT POPULATE
DO NOT POPULATE
ON SEMICONDUCTOR 2N7002LT1G
YAGEO
9C06031A4701FKHFT
AN1926 Rev 1.00
August 15, 2014
Page 4 of 10
ISL8270MEVAL1Z
Configuration File
Sample Configuration File for ISL8270M Module. Copy and paste (from RESTORE_FACTORY TO ### End User Store) to a notepad and
save it as Confile_file_name.txt. The # symbol is used for a comment line. Following settings are already loaded to ISL8270M module
as factory defaults.
RESTORE_FACTORY
STORE_USER_ALL
# VOUT Related
VOUT_COMMAND
VOUT_MAX
VOUT_MARGIN_HIGH
VOUT_MARGIN_LOW
VOUT_OV_FAULT_LIMIT
VOUT_OV_FAULT_RESPONSE
VOUT_OV_WARN_LIMIT
VOUT_UV_WARN_LIMIT
VOUT_UV_FAULT_LIMIT
VOUT_UV_FAULT_RESPONSE
POWER_GOOD_ON
VOUT_TRANSITION_RATE
VOUT_DROOP
VOUT_CAL_OFFSET
# IOUT Related
IOUT_CAL_GAIN
IOUT_CAL_OFFSET
IOUT_OC_FAULT_LIMIT
IOUT_UC_FAULT_LIMIT
MFR_IOUT_OC_FAULT_RESPONSE
MFR_IOUT_UC_FAULT_RESPONSE
ISENSE_CONFIG
# Other Faults
OT_FAULT_LIMIT
OT_FAULT_RESPONSE
OT_WARN_LIMIT
UT_WARN_LIMIT
UT_FAULT_LIMIT
UT_FAULT_RESPONSE
VIN_OV_FAULT_LIMIT
VIN_OV_FAULT_RESPONSE
VIN_OV_WARN_LIMIT
VIN_UV_WARN_LIMIT
VIN_UV_FAULT_LIMIT
VIN_UV_FAULT_RESPONSE
#Enable, Timing and Sequence Related
ON_OFF_CONFIG
TON_DELAY
TON_RISE
TOFF_DELAY
TOFF_FALL
POWER_GOOD_DELAY
FREQUENCY_SWITCH
SYNC_CONFIG
SEQUENCE
# Manufacturer Related
MFR_ID
MFR_MODEL
MFR_REVISION
MFR_LOCATION
MFR_DATE
MFR_SERIAL
USER_DATA_00
# Advance Settings
USER_CONFIG
DDC_CONFIG
DDC_GROUP
# Loop Compensation
ASCR_CONFIG
STORE_USER_ALL
### End User Store
# reset device to the factory setting
# Clears user memory space
0x2666
0x2a3c
0x2851
0x247a
0x2c28
0x80
0x2a3c
0x228f
0x20a3
0x80
0x228f
0xba00
0x0000
0x0000
0xb380
0x0000
0xdbc0
0xdc3f
0x80
0x80
0x05
0xebe8
0x80
0xeb70
0xdc40
0xe530
0x80
0xd380
0x80
0xd327
0xca79
0xca40
0x80
0x17
0xca80
0xca80
0xca80
0xca80
0xba00
0x0215
0x00
0x0000
Intersil Corp
ISL8270MEVAL1Z
Rev-1
Milpitas, CA
3/14/2014
1234
Module
0x00
0x01
0x00000000
0x15a0100
# Store all above settings to NVRAM
# 1.2 V
# 1.32 V
# 1.26 V
# 1.14 V
# 1.38 V
# Disable and no retry
# 1.32 V
# 1.08 V
# 1.02 V
# Disable and no retry
# 1.08 V
# 1 mV/us
# 0 mV/A
# 0 mV/A
# 0.875 mV/A
#0A
# 30 A
# -30A
# Disable and no retry
# Disable and no retry
# 256ns Blanking time, Mid-Range
# 125 °C
# Disable and no retry
# 110 °C
# -30 °C
# -45 °C
# Disable and no retry
# 14 V
# Disable and no retry
# 12.609 V
# 4.945 V
# 4.5 V
# Disable and no retry
# Pin Enable, Immediate Off
# 5 ms
# 5 ms
# 5 ms
# 5 ms
# 1 ms
# Sequence Disabled
# Use Pin-strap for FSW setting
# 533 kHz
# Example Only
# Example Only
# Example Only
# Example Only
# Example Only
# Example Only
# Example Only
# Open Drain PG, XTEMP Disabled
# DDC rail ID = 1
# All Broadcast disabled
# ASCR gain = 256, Residual = 90
AN1926 Rev 1.00
August 15, 2014
Page 5 of 10
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